You used to be able to get a round the world F ticket for 120k miles. Including Swiss, Thai, Lufthansa Asiana and ANA first class.
The "numerical" value of these tickets was way more than anything one can get today.
I have a ticket booked for 185k to Asia with 2 stopovers in Europe, that in theory would cost $25k. But thats just theory because I would never pay that in cash.
walk down memory lane for truly amazing redemptions:
List of valid and booked mini-RTW itineraries